Double-tread pneumatic tire



. S pt, 2 0, 1927.

J. E. B'OVE nouans mam PNEUMATIC TIRE Filed March a, 1926 Inventor cZlLBove,

Attorney i .Patented Sept. l927.-

UNITED STATES PATENT ol-rlcs.

JOSEPH n. nova; or xnanmz; NEW JERSEY.

DOUBLE-{BREAD rnnumnrrc rrma Application filed March 8, 1926. Serial No. 91,972.

. grally joined at the rim engaging surface thereof, and wherein the adjacent inner sides of the shoe and tube of the tire are so associated as to absolutely prevent the pinching of the tube-by theshoe which is now a dis.- advantage of the pneumatic tires upon the market consisting of a: separate tube and shoe.

A further object is to provide a tire con-. struction of this character wherein air s aces are provided between the tube and s 0e between the tread portion, rim portion, and side walls of the tire for, greatly enhancingthe resiliency of the tire when mflated. I

A final'salient object isto provide a tire of this character that may be manufactured and marketed as chealy as a combined shoe and inner tube of wh ch the pneumatic tires now upon the market usually exist.

, Other objects will become ap arent as the nature of the-invention will be better understood, the same comprising the novel form shown I claimed.

of tire hereinafter more fully described,

7 in' the accompanying drawing and In the drawing:-

7 The figure is a combined fragmentary perective and cross section of a tire construct1on in accordance with thepresent invention, the side wall-of the shoe being partly broken away for more clearly disclosing the {interconnecting and spacing means between the shoe and air tube.

Now havin particular reference to the drawing, 5 indicates an inner tube whichlis constructed of the'same material, usually rubber, as the separate inner tubes now upon the market. In this instance, however, the thickness of the tube 5 is considerably greater than the thickness of the conventional. innertube in order that the same will tain the tube and shoe in spaced withstand the proper air pressure without becoming unduly expanded. w

- Arranged slightly eccentrically around the tube 5 is a protecting shoe f vulcanized rubber. This shoe is entirely closed and is formed at its inner side in such a manner as to provide'a cylindrical surface 7 thatis beaded at its opposite edges to facilitatethe' form of wheel rim.'.

The tube 5 and shoe 6 are interconnected attachment of the tire upon a conventional by a vulcanized rubber strip 8 at the rim sides thereof 'whiletleading from the tube at said rim side and passing throu h thecenter} ofthe cylindrical portion 7 o the shoev 6 is-a conventional form of inflating valve 9.

Arranged intermediate the tube 5 and shoe 6 at the tread'portionthereof isa-strip of porous rubber 10 that extends completely around the tire and to which said shoe and tube are joined by vulcanization.

Similarly disposed between the shoe and tube at the side walls thereof are stri s ofporous rubber- 11 to which said tube an shoe are secured by vulcanization, these stri s also extending entirely around the tire. T e

crease in thickness toward the center of the I tread portion of the inner tube. The tube is then inflated. to the desired size in order to accommodate the tire shoe 6, and the-tire shoe 6 .is built around theinner tube and the strips vulcanized thereon, and this outer shoe is vulcanized to the strip so that a unitary structure is provided. I

Thestrips 10 and 11-11 obviously mainositions and prevent the rubbing of the tu' the interior of the shoe and alsorovide air spaces between the shoe and tu at four upon spaced points as clearly'shown in the vdrawing, these air spaces permittin the shoeto 1 4 be depressed at these points without in any manner affecting the tube" 5 and also for practically preventing the puncturing ofgth'e tube as well as'the shoe at these points.

By reason of thestri s of porous rubber between the shoe and tu e, said tube will be ractically 'pimctureproof at these points, ut shculd' a nail or particles of glass reach the tube at these points, the holes or openings would be immediately sealed by the action of the porous rubber, the nature of which is to tend to close any opening in the rubber by its inherent ualities.

It will thus be seen t at I have provided a highly novel, simple, but yet efiicient form of pneumatic tire that is well adapted for all the purposes heretofore designated, but even though I have herein shown and described the most practical embodimenfiof the invention with which I am at this time comprising an inner tube of relatively great thickness, an outer shoe arranged eccentrically around the tire for providing a space face being beaded at its opposite edges to facilitate the attachment of the tire upon a conventional wheel rim, circumferentially extending strips of rubber arranged between the inner tube and the shoe at the tread and side walls thereof, for maintaining the same in spaced relation, and an additional relatively wide strip of rubber extending circumferentially between the rim side of the outer shoe and the adjacent portion of the inner tube, said strip eing formed of por- 011s rubber and vulcanized t0 the outer and inner walls of the inner tube and outer shoe respectively, the strips gradually increasin in thickness toward the center of the tread portion of the tire, and further providing circumferentially extending air pockets.

In testimony whereof I affix my signature.

JOSEPH E. BOVE. 

